Chocolate Peanut Butter Mousse Bars

These have become an absolute staple in my house! Also, it is my total standard recipe for 'gotta-bring-something-sweet' to 'fill-in-the-blank'. SO easy, SO fast and terrific for satisfying those cravings. I chill the peanut butter base for 15 or 20 minutes before topping with the chocolate so the warm chocolate doesn't melt into the peanut butter too much, making spots of too thick chocolate and leaving other areas spread too thin!